Add the ground beef, panko, onions, oyster sauce, worcestershire sauce and black pepper to a bowl
and mix until well combined, but don't be too aggressive with your mixing or it will make the
patties too dense.

Split the mixture into 4 pieces
and form them into 4 patties that are
about a 3/4-inch (2cm) thick.
 
Heat a sauté pan over medium heat until hot,
and then add the oil. Add the patties and
fry until they have a brown crust on one side
(about 2 1/2 minutes).

Flip the patties and fry until they’re cooked through (another 2 1/2 minutes).

Transfer the patties to a plate and then add the mushrooms,
sauteéing until the mushrooms are well browned.

While the mushrooms are frying heat another sauté pan,
add a bit of oil and fry the eggs however you like them.

Push the mushrooms to the sides of the pan and melt the
butter in the center along with the flour.
Fry the roux until a medium brown.

Remove the pan from the heat and whisk in the beef stock, soy sauce and bourbon.

Once the mixture is smooth and free of lumps, put it
back on the stove and bring to a boil, cooking until the
gravy is nice and thick.

To plate the Loco Moco, first put
down a mound of hot rice. Top with the beef patties and then
sprinkle on a handful of fried shallots.
Cover everything with
the mushroom gravy and then top with a fried egg.